/****************************************************************************
 **
 ** Copyright (C) 2004-2005 Trolltech AS. All rights reserved.
 **
 ** This file is part of the documentation of the Qt Toolkit.
 **
 ** This file may be used under the terms of the GNU General Public
 ** License version 2.0 as published by the Free Software Foundation
 ** and appearing in the file LICENSE.GPL included in the packaging of
 ** this file.  Please review the following information to ensure GNU
 ** General Public Licensing requirements will be met:
 ** http://www.trolltech.com/products/qt/opensource.html
 **
 ** If you are unsure which license is appropriate for your use, please
 ** review the following information:
 ** http://www.trolltech.com/products/qt/licensing.html or contact the
 ** sales department at sales@trolltech.com.
 **
 ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
 ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 **
 ****************************************************************************/

#include <QtGui>

#include "borderlayout.h"

BorderLayout::BorderLayout(QWidget *parent, int margin, int spacing)
: QLayout(parent)
{
  setMargin(margin);
  setSpacing(spacing);
}

BorderLayout::BorderLayout(int spacing)
{
  setSpacing(spacing);
}

BorderLayout::~BorderLayout()
{
  QLayoutItem *l;
  while ((l = takeAt(0)))
    delete l;
}

void BorderLayout::addItem(QLayoutItem *item)
{
  add(item, West);
}

void BorderLayout::addWidget(QWidget *widget, Position position)
{
  add(new QWidgetItem(widget), position);
}

Qt::Orientations BorderLayout::expandingDirections() const
{
  return Qt::Horizontal | Qt::Vertical;
}

bool BorderLayout::hasHeightForWidth() const
{
  return false;
}

int BorderLayout::count() const
{
  return list.size();
}

QLayoutItem *BorderLayout::itemAt(int index) const
{
  ItemWrapper *wrapper = list.value(index);
  if (wrapper)
    return wrapper->item;
  else
    return 0;
}

QSize BorderLayout::minimumSize() const
{
  return calculateSize(MinimumSize);
}

void BorderLayout::setGeometry(const QRect &rect)
{
  ItemWrapper *center = 0;
  int eastWidth = 0;
  int westWidth = 0;
  int northHeight = 0;
  int southHeight = 0;
  int centerHeight = 0;
  int i;
  
  QLayout::setGeometry(rect);

  for (i = 0; i < list.size(); ++i) {
    ItemWrapper *wrapper = list.at(i);
    QLayoutItem *item = wrapper->item;
    Position position = wrapper->position;
    
    if (position == North) {
      item->setGeometry(QRect(rect.x(), northHeight, rect.width(),
			      item->sizeHint().height()));
      
      northHeight += item->geometry().height() + spacing();
    } else if (position == South) {
      item->setGeometry(QRect(item->geometry().x(),
			      item->geometry().y(), rect.width(),
			      item->sizeHint().height()));
      
      southHeight += item->geometry().height() + spacing();
      
      item->setGeometry(QRect(rect.x(),
			      rect.y() + rect.height() - southHeight + spacing(),
			      item->geometry().width(),
			      item->geometry().height()));
    } else if (position == Center) {
      center = wrapper;
    }
  }
  
  centerHeight = rect.height() - northHeight - southHeight;
  
  for (i = 0; i < list.size(); ++i) {
    ItemWrapper *wrapper = list.at(i);
    QLayoutItem *item = wrapper->item;
    Position position = wrapper->position;
    
    if (position == West) {
      item->setGeometry(QRect(rect.x() + westWidth, northHeight,
			      item->sizeHint().width(), centerHeight));
      
      westWidth += item->geometry().width() + spacing();
    } else if (position == East) {
      item->setGeometry(QRect(item->geometry().x(), item->geometry().y(),
			      item->sizeHint().width(), centerHeight));
      
      eastWidth += item->geometry().width() + spacing();
      
      item->setGeometry(QRect(
			      rect.x() + rect.width() - eastWidth + spacing(),
			      northHeight, item->geometry().width(),
			      item->geometry().height()));
            }
  }
  
  if (center)
    center->item->setGeometry(QRect(westWidth, northHeight,
				    rect.width() - eastWidth - westWidth,
				    centerHeight));
}

QSize BorderLayout::sizeHint() const
{
  return calculateSize(SizeHint);
}

QLayoutItem *BorderLayout::takeAt(int index)
{
  if (index >= 0 && index < list.size()) {
    ItemWrapper *layoutStruct = list.takeAt(index);
    return layoutStruct->item;
  }
  return 0;
}

void BorderLayout::add(QLayoutItem *item, Position position)
{
  list.append(new ItemWrapper(item, position));
}

QSize BorderLayout::calculateSize(SizeType sizeType) const
{
  QSize totalSize;
  
  for (int i = 0; i < list.size(); ++i) {
    ItemWrapper *wrapper = list.at(i);
    Position position = wrapper->position;
    QSize itemSize;
    
    if (sizeType == MinimumSize)
      itemSize = wrapper->item->minimumSize();
    else // (sizeType == SizeHint)
      itemSize = wrapper->item->sizeHint();
    
    if (position == North || position == South || position == Center)
      totalSize.rheight() += itemSize.height();
    
    if (position == West || position == East || position == Center)
      totalSize.rwidth() += itemSize.width();
  }
        return totalSize;
}
